PostgreSQL on Docker部署时的shm配置注意

作者

digoal

日期

2018-01-10

标签

PostgreSQL , docker , shm , 动态共享内存

背景

如果你使用docker启动PG时，遇到类似这样的问题，可能你需要看看docker的/dev/shm是不是不够大。

"ERROR: could not resize shared memory segment "/PostgreSQL.388782411" to 50438144 bytes: No space left on device SQL state: 53100"

调整docker启动参数--shm-size

```
Thank you Thomas,

I make it work with extra setting --shm-size=1g in my docker run script.

It works with 'none' and 'sysv'--I think the issue is that technically our
environment does support 'posix', but '/dev/shm' is indeed not mounted in
the LXC container, leading to a discrepancy between what initdb decides and
what's actually possible. Thanks for your help.

Thanks,
Maciek
```

相关PostgreSQL代码

src/backend/storage/ipc/dsm_impl.c

相关Docker参数

``` --ipc="MODE" : Set the IPC mode for the container

Value Description ”” Use daemon’s default. “none” Own private IPC namespace, with /dev/shm not mounted. “private” Own private IPC namespace. “shareable” Own private IPC namespace, with a possibility to share it with other containers. “container: <name-or-ID>" Join another (“shareable”) container’s IPC namespace. “host” Use the host system’s IPC namespace.

--shm-size=""
Size of /dev/shm. The format is . number must be greater than 0. Unit is optional and can be b (bytes), k (kilobytes), m (megabytes), or g (gigabytes). If you omit the unit, the system uses bytes. If you omit the size entirely, the system uses 64m. ```

参考

https://www.postgresql.org/message-id/flat/20140612090731.GB6907%40msgid.df7cb.de#20140612090731.GB6907@msgid.df7cb.de

http://www.postgresql-archive.org/Fwd-Query-error-could-not-resize-shared-memory-segment-td5998965.html#a5999004

https://docs.docker.com/engine/reference/run/

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